<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<script>
  // 定义json
  var json = {
    "name":"zhangsan",
    "age":23,
    "addr":["北京", "上海", "西安"]
  };

  // 获取值
  alert(json.name);

</script>


</body>
</html>